Castrisch is a former municipality in the district of Surselva in the Swiss canton of Graubünden. Until 1943, it was officially known as Kästris. On 1 January 2014 the former municipalities of Castrisch, Ilanz, Ladir , Luven , Pitasch , Riein , Ruschein , Schnaus , Sevgein , Duvin , Pigniu , Rueun and Siat merged into the new municipality of Ilanz/Glion .

Castrisch is first mentioned in 765 as Castrices.

Before the merger, Castrisch had a total area of 7.2 km2 (2.8 sq mi). Of this area, 40.8% is used for agricultural purposes, while 51.3% is forested.